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Vol.9, No.4; April 1996 Contents FEATURES 6 Dead Phone Battery? – Refill It With Standard AA Rechargeable Cells & Save Big Dollars Fed up with paying big dollars to replace the battery for your mobile phone. Here’s how to refurbish it with standard rechargeable cells that together cost must less than the price of a new battery – by Ross Tester 14 Traction Control In Motor Racing; Pt.2 Traction control was permitted in Formula 1 racing in 1993. We take a look at how the technology was applied – by Julian Edgar REPLACE DEAD PHONE BATTERIES WITH LOW-COST RECHARGEABLE AA CELLS & SAVE MONEY – PAGE 6 56 Cathode Ray Oscilloscopes, Pt.2 Find out how cathode ray oscilloscopes work. This month, we look at deflection options, blanking circuits and triggering methods – by Bryan Maher PROJECTS TO BUILD 22 A High-Power Hifi Amplifier Module This rugged new power amplifier will deliver 175W into a 4-ohm load or 125W into an 8-ohm load. It uses the latest plastic power transistors and is suitable for use with musical instruments or for hifi applications – by Leo Simpson & Bob Flynn 53 Replacement Module For The SL486 & MV601 Remote Control Receiver ICs A new IR receiver subsystem and a specially programmed Z86 microcontroller make this module easy to build. It replaces two obsolescent Plessey ICs – by Rick Walters HIGH-POWER 125-WATT AMPLIFIER MODULE – PAGE 22 72 Avoid Expensive Repairs – Build A Knock Indicator For Leaded-Petrol Engines Knocking (or pinging) can cause serious engine damage and many older cars are now starting to knock because of the reduced lead content in super grade petrol. This simple circuit will warn you when engine knock is occurring so that you can ease up and avoid costly engine damage – by John Clarke SPECIAL COLUMNS 38 Serviceman’s Log When I switch it on, nothing happens – by the TV Serviceman 65 Radio Control Multi-channel radio control transmitter; Pt.3 – by Bob Young REPLACEMENT MODULE FOR THE SL486 & MV601 ICs – PAGE 42 84 Vintage Radio A look back at transistor radios – by John Hill DEPARTMENTS 2 Publisher’s Letter 3 Mailbag 13 Order Form 80 Circuit Notebook 88 Product Showcase 91 Ask Silicon Chip 94 Market Centre 96 Advertising Index KNOCK INDICATOR FOR CAR ENGINES – PAGE 72 April 1996  1